<#
.SYNOPSIS
Modifies an existing vCenter and optionally discovers any ESXi host managed by that vCenter.
.DESCRIPTION
Modifies vCenter servers on the network and optionnaly create a host configuration for multiple ESXi hosts managed by a single vCenter server.
You can't modify vCenter parameters and import hosts in the same command.
For any discovered vCenters, you can enable or disable access for any ESXi host managed by the vCenter.
After you associate a vCenter server configuration with a VMware datastore, the datastore is available to any ESXi hosts associated with the vCenter host configuration.
The vCenter credentials are stored in the storage system.
You need to have an active session with the array.
.NOTES
Written by Erwan Quelin under MIT licence - https://github.com/equelin/Unity-Powershell/blob/master/LICENSE
.LINK
https://github.com/equelin/Unity-Powershell
.PARAMETER Session
Specify an UnitySession Object.
.PARAMETER ID
vCenter ID or Object.
.PARAMETER NewAddress
The new FQDN or IP address of the VMware vCenter.
.PARAMETER NewUsername
Specifies the new username used to access the VMware vCenter.
.PARAMETER NewPassword
Specifies the new password used to access the VMware vCenter.
.PARAMETER Description
Specifies the new description of the VMware vCenter server.
.PARAMETER Username
Specifies the new username used to access the VMware vCenter.
.PARAMETER Password
Specifies the new password used to access the VMware vCenter.
.PARAMETER ImportHosts
Specifies if hosts are automatically imported.
.EXAMPLE
Set-UnityvCenter -ID 'mss_1' -Description 'New description'

#vCenter[Parameter(Mandatory=$true,ValueFromPipeline=$True,ValueFromPipelinebyPropertyName=$True,HelpMessage='vCenter ID or Object')]$ID,[Parameter(Mandatory=$false,ParameterSetName="Set",HelpMessage='The new FQDN or IP address of the vCenter server')][String]$NewAddress,[Parameter(Mandatory=$false,ParameterSetName="Set",HelpMessage='The new user name to access vCenter server')][string]$NewUsername,[Parameter(Mandatory=$false,ParameterSetName="Set",HelpMessage='The new password to connect to vCenter server')][String]$NewPassword,[Parameter(Mandatory=$false,ParameterSetName="Set",HelpMessage='The new description of the vCenter server')][String]$Description,[Parameter(Mandatory=$true,ParameterSetName="ImportHosts",HelpMessage='The user name to access vCenter server')][string]$Username,[Parameter(Mandatory=$true,ParameterSetName="ImportHosts",HelpMessage='The password to connect to vCenter server')][String]$Password,[Parameter(Mandatory=$true,ParameterSetName="ImportHosts",HelpMessage='Specifies if hosts are automatically imported')][Switch]$ImportHosts)

# Determine input and convert to an objectWrite-Verbose"Input object type is $($I.GetType().Name)"Switch($I.GetType().Name){"String"{$vCenterServer=get-UnityvCenter-Session$Sess-ID$I$vCenterServerID=$vCenterServer.id}"UnityHostContainer"{$vCenterServer=$I$vCenterServerID=$ID.id}}

#Executing Get-UnityUser with the ID of the Set userGet-UnityvCenter-Session$Sess-ID$vCenterServerID}}else{Write-Warning"You are no longer connected to EMC Unity array: $($Sess.Server)"}}'ImportHosts'{